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If this is an equivalent to the blinking floppy icon, it could be that the ZuluSCSI is taking a few seconds to start up. My BlueSCSI V2s take a little extra time to get themselves "ready" before they boot. Maybe not 10 seconds, but enough that I do get the floppy icon for a couple seconds before...

My 1400c has a 16GB CF card in it right now, but only because I received it that way and it’s good enough - I would have gone the SD route if I was upgrading it myself. CF works fine, but it’s super finicky finding a card that a laptop will play nice with. They’re also just expensive compared to...

I'm glad that you were able to get your keyboard fixed and working!

Now I wish I had taken a photo of the one that showed up on eBay a few months ago...

I have one from that same brand, yes. I've only rebuilt one battery with it so far (my PowerBook 1400 battery), so far so good. Works well.

I feel like fabricating a new rubber sheet should be another option, given that seems to be what makes the Duo keyboard so awful to type on. It probably wasn’t great to begin with though.

Your keyboard issue is likely caused by the conductive membrane oxidizing over time. You may be able to clean it, or you may need to paint over the contacts on those bad keys with a conductive paint/pen. It’s an issue that plagues most Duo keyboards these days.

Thank you! I will get all of this up on the capacitor reference library soon.

And here's a much-needed new Macintosh Portal homepage! I really like how this one turned out.

Excellent thread as always! This is the best Duo restore thread I've seen - I might link this directly from MacDat. For cap reference - I'm missing the values for the power supply and the Mini Dock. Did you happen to note those down? Will get your photos up soon on the Repair Portal :)

My guess would be that it was added in a later hardware revision, perhaps the single battery wasn’t performing well enough.

Ah, so that explains it - just extra capacity. Maybe these can keep the system alive in suspend mode while the main battery is swapped out? A lot of PC laptops could do that, but they usually used a Varta NiMH pack rather than a lithium rechargeable.

I've been cooking up a new fancier homepage for MacDat... what do y'all think? Not fully finalized, but close. The rest of the site's styling is staying the same.

There's a RIFA in the Duo power supply that blows up all the time. I'd replace them.

Probably needs recapping - that's necessary now on these. If the lines don't go away after a recap, then it's probably bad connections where the ribbons bond to the glass, or bad traces inside those ribbons from corrosion.

You cannot wire the VBATT wire in with VMAIN because VBATT has to be a 1A current regulated supply. If you have one 16V laptop brick, say at 4A, leaving it plugged in with the laptop powered off when it's wired this way will send 4A straight into the battery - not good.